Vortices Clustering: The Origin of the Second Peak in the Magnetisation Loops of High Temperature Superconductors

Details Vortices Clustering: The Origin of the Second Peak in the Magnetisation Loops of High Temperature Superconductors Vortices Clustering: The Origin of the Second Peak in the Magnetisation Loops of High Temperature Superconductors

1999-08-30

arxiv.org/abs/cond-mat/9908454v2

Physics

Condensed Matter

Superconductivity

11 pages + 3 figures

Scientific paper

10.1209/epl/i2000-00425-9

We study vortex clustering in type II Superconductors. We demonstrate that the ``second peak'' observed in magnetisation loops may be a dynamical effect associated with a density driven instability of the vortex system. At the microscopic level the instability shows up as the clustering of individual vortices at (rare) preferential regions of the pinning potential. In the limit of quasi-static ramping the instability is related to a phase transition in the equilibrium vortex system.

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